asc2ans.c

/* asc2ans.c */

/* Converts Synchronet Ctrl-A codes into ANSI escape sequences */

/* $Id: asc2ans.c,v 1.12 2020/05/09 23:06:53 rswindell Exp $ */

/****************************************************************************
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 *																			*
 * Copyright Rob Swindell - http://www.synchro.net/copyright.html			*
 *																			*
 * This program is free software; you can redistribute it and/or			*
 * modify it under the terms of the GNU General Public License				*
 * as published by the Free Software Foundation; either version 2			*
 * of the License, or (at your option) any later version.					*
 * See the GNU General Public License for more details: gpl.txt or			*
 * http://www.fsf.org/copyleft/gpl.html										*
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 ****************************************************************************/

#include <stdio.h>
#include <ctype.h>		/* toupper */
#include <string.h>		/* strcmp */

#ifdef _WIN32
	#include <Windows.h>	/* SetConsoleMode */
	#ifndef ENABLE_VIRTUAL_TERMINAL_PROCESSING
	#define ENABLE_VIRTUAL_TERMINAL_PROCESSING 0x0004
	#endif
#endif

#define CTRL_A	'\1'
#define ANSI	fprintf(out,"\x1b[")

static void print_usage(const char* prog)
{
	char revision[16];

	sscanf("$Revision: 1.12 $", "%*s %s", revision);

	fprintf(stderr,"\nSynchronet Ctrl-A-Code to ANSI-Terminal-Sequence Conversion Utility v%s\n",revision);
	fprintf(stderr,"\nusage: %s infile.asc [outfile.ans] [[option] [...]]\n",prog);
	fprintf(stderr,"\noptions:\n\n");
	fprintf(stderr,"-strip            strip Ctrl-A codes without ANSI equivalent, e.g. pause, delay\n");
}

int main(int argc, char **argv)
{
	int		ch;
	int		i;
	int		strip=0;
	FILE*	in=stdin;
	FILE*	out=stdout;

	if(argc<2) {
		print_usage(argv[0]);
		return(0); 
	}

	for(i=1; i<argc; i++)  {
		if(argv[i][0]=='-') {
			if(strcmp(argv[i], "-strip") == 0)
				strip = 1;
			else {
				print_usage(argv[0]);
				return 0;
			}
		} else if(in==stdin) {
			if((in=fopen(argv[i],"rb"))==NULL) {
				perror(argv[i]);
				return(1); 
			}
		} else if(out==stdout) {
			if((out=fopen(argv[i],"wb"))==NULL) {
				perror(argv[i]);
				return(1);
			}
		}
	}

#ifdef _WIN32
	if(out == stdout) {
		DWORD conmode = 0;
		if(GetConsoleMode(GetStdHandle(STD_OUTPUT_HANDLE), &conmode)) {
			SetConsoleMode(GetStdHandle(STD_OUTPUT_HANDLE), conmode | ENABLE_VIRTUAL_TERMINAL_PROCESSING);
		}
	}
#endif

	while((ch=fgetc(in))!=EOF) {
		if(ch==CTRL_A) { /* ctrl-a */
			ch=fgetc(in);
			if(ch==EOF || ch=='Z')	/* EOF */
				break;
			if(ch>0x7f) {					/* move cursor right x columns */
				int cnt=ch-0x7f;
				ANSI;
				if(cnt>1)
					fprintf(out,"%u",cnt);
				fputc('C',out);
				continue; 
			}
			switch(toupper(ch)) {
				case 'A':
					fputc('\1',out);
					break;
				case '<':
					fputc('\b',out);
					break;
				case '>':
					ANSI;
					fputc('K',out);
					break;
				case '[':
					fputc('\r',out);
					break;
				case ']':
					fputc('\n',out);
					break;
				case 'J':				
					ANSI;	
					fprintf(out,"J");	/* clear to EOS */
					break;
				case 'L':
					ANSI;	
					fprintf(out,"2J");	/* clear screen */
					/* fall-through */
				case '\'':
					ANSI;
					fprintf(out,"H");	/* home cursor */
					break;
				case '-':
				case '_':
				case 'N':
					ANSI;
					fprintf(out,"0m");
					break;
				case 'H':
					ANSI;
					fprintf(out,"1m");
					break;
				case 'I':
					ANSI;
					fprintf(out,"5m");
					break;
				case 'K':
					ANSI;
					fprintf(out,"30m");
					break;
				case 'R':
					ANSI;
					fprintf(out,"31m");
					break;
				case 'G':
					ANSI;
					fprintf(out,"32m");
					break;
				case 'Y':
					ANSI;
					fprintf(out,"33m");
					break;
				case 'B':
					ANSI;
					fprintf(out,"34m");
					break;
				case 'M':
					ANSI;
					fprintf(out,"35m");
					break;
				case 'C':
					ANSI;
					fprintf(out,"36m");
					break;
				case 'W':
					ANSI;
					fprintf(out,"37m");
					break;
				case '0':
					ANSI;
					fprintf(out,"40m");
					break;
				case '1':
					ANSI;
					fprintf(out,"41m");
					break;
				case '2':
					ANSI;
					fprintf(out,"42m");
					break;
				case '3':
					ANSI;
					fprintf(out,"43m");
					break;
				case '4':
					ANSI;
					fprintf(out,"44m");
					break;
				case '5':
					ANSI;
					fprintf(out,"45m");
					break;
				case '6':
					ANSI;
					fprintf(out,"46m");
					break;
				case '7':
					ANSI;
					fprintf(out,"47m");
					break;
				case 'Z':	/* Actually a lower-case 'z' */
					fputc('\x1a',out);	/* Ctrl-Z (substitute) char */
					break;
				default:
					if(!strip)
						fprintf(out,"\1%c",ch);
					break; 
			} 
		}
		else
			fputc(ch,out); 
	}

	return(0);
}